Coherent beam combining of 137 W 2 × 2 fiber amplifier array |
| |
Authors: | Xiaolin Wang Yanxing Ma Bing He Yuhao Xue Zhen Li Jun Zhou Yijun Zhao |
| |
Institution: | a College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, Chinab Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800, China |
| |
Abstract: | We demonstrate coherent beam combining of two-dimensional fiber amplifier arrays with a total of 137 W output power using stochastic parallel gradient descent (SPGD) algorithm. Compact all-fiber polarization-maintained single frequency fiber amplifier chains are developed and four fiber amplifiers are arranged to 2 × 2 laser array with a fill factor of 70% in the near-field. Active phase control is implemented by a digital signal processor (DSP) based SPGD controller. The fringe visibility of the coherent combined beam profile is as high as 81% when the system is closed-loop controlled despite perturbations of the environment. |
| |
Keywords: | Fiber laser Fiber amplifier Coherent beam combining Stochastic parallel gradient descent algorithm |
本文献已被 ScienceDirect 等数据库收录! |